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USCG Exam PracticeElectrical fundamentals — DC/AC, motors, distribution

Which characteristic distinguishes alternating current (AC) from direct current (DC)?

  1. A. AC flows in one direction at a steady value, while DC periodically reverses direction.
  2. ✓ AC periodically reverses direction and continuously changes in amplitude, while DC flows in one direction at a steady value.Correct
  3. C. AC can only be produced by a commutator-equipped machine, while DC is produced by an alternator.
  4. D. AC requires a commutator to maintain unidirectional flow, while DC does not.

Why B is correct

AC periodically reverses direction and continuously changes in amplitude; DC flows in one direction at a steady value. The commutator is a DC machine component, not an AC one. NEETS Mod. 2 §1-1.

Cited:NEETS Mod. 2 §1-1

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Which characteristic distinguishes alternating current (AC) from di… — USCG Exam Practice · CaptainsGround